Home / 85,365.20-128,047.80-40,969.10

Finding the Fourth Proportional to 85,365.20, 128,047.80 and 40,969.10

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Solution

The fourth proportional to 85,365.20, 128,047.80 and 40,969.10 is: 61,453.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,365.20 : 128,047.80 = 40,969.10 : x
  2. Step 2: Convert to fraction form
    85,365.20/128,047.80 = 40,969.10/x
  3. Step 3: Cross multiply
    85,365.20x = 128,047.80 × 40,969.10
  4. Step 4: Simplify right side
    85,365.20x = 5,246,003,122.98
  5. Step 5: Solve for x
    x = 5,246,003,122.98/85,365.20
  6. Step 6: Final answer
    x = 61,453.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.